A very goog point.
There is a list, but it's complicated, not easy to find and
confusing, even to people who know it exists and know what it
is used for. Plus, I don't think most hobbiest orchidists even realize
that some paphs are illegal.
I suspect a visit from Fish and Wildlife to most people might
cure their 'slipper addiction.'
CITES regulates all kinds of things and not just slipper orchids.
However, a lot of people don't even know that CITES exists.
I've always heard that 'ignorance of the law is not an exuse' but
I would hope that Fish & Wildlife might be able to tell the difference
between people who are trying to import illegal plants and those who
happen to unknowingly.